Concrete spacer



FIG. 1 is a top perspective view of the concrete spacer in accordance with the new design;

FIG. 2 is a bottom perspective view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a side elevation view thereof; the right and left sides being mirror images of each other; and,

FIG. 6 is a front elevation view thereof; the front and back being mirror images of each other.

The broken lines in FIG. 1 illustrate environmental subject matter only and form no part of the claimed design. 

CLAIM The ornamental design for a concrete spacer, as shown and described herein. 